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Finding the Fourth Proportional to 31.89, 44.07 and 28.24

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Solution

The fourth proportional to 31.89, 44.07 and 28.24 is: 39.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.89 : 44.07 = 28.24 : x
  2. Step 2: Convert to fraction form
    31.89/44.07 = 28.24/x
  3. Step 3: Cross multiply
    31.89x = 44.07 × 28.24
  4. Step 4: Simplify right side
    31.89x = 1,244.54
  5. Step 5: Solve for x
    x = 1,244.54/31.89
  6. Step 6: Final answer
    x = 39.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.